<!doctype html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport"
          content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
</head>
<body>

<div id="app">


    <input type="text" placeholder="用户名" v-model="username"><br>
    <input type="text" placeholder="密码" v-model="password"><br>
    <select v-model="sex">
        <option value="1">男</option>
        <option value="2">女</option>
    </select>
    <br>
    <input>

</div>

<script src="./node_modules/vue/dist/vue.js"></script>
<script>

    var dataObj = {

    }

//双向绑定
    var vm = new Vue({

    })

</script>
</body>
</html>
